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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Interest bearing deposits, banks $ 17,871us-gaap_InterestBearingDepositsInBanks $ 8,405us-gaap_InterestBearingDepositsInBanks
Held-to-maturity securities, fair values $ 772,843us-gaap_HeldToMaturitySecuritiesFairValue $ 619,617us-gaap_HeldToMaturitySecuritiesFairValue
Preferred stock, no par value $ 0us-gaap_PreferredStockNoParValue $ 0us-gaap_PreferredStockNoParValue
Preferred stock, shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 2.0833us-gaap_CommonStockParOrStatedValuePerShare $ 2.0833us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 50,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 38,546,042us-gaap_CommonStockSharesIssued 29,367,511us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 38,449,812us-gaap_CommonStockSharesOutstanding 29,298,188us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 96,230us-gaap_TreasuryStockShares 69,323us-gaap_TreasuryStockShares